I put 8.5 quarts in, that is 8.04 liters, I thought the car called for 8.5 liters. I drove the car and checked the dipstick after about ten minutes of sitting and it was halfway between the marks. If it was over filled would there be a warning that the oil was too high? I know there is a low oil warning. Thanks again

Good to see the level dropped after a drive.

Both the 645 and 650 will display "Oil level at the minimum" message on iDrive if the oil level drops to minimum or below. I think only the 650i has the "Engine oil level too high" warning, based on what I see in the owner's manual for the two models.